import { Cartesian3 } from '../../Source/Cesium.js';
import { Cartesian4 } from '../../Source/Cesium.js';
import { Math as CesiumMath } from '../../Source/Cesium.js';
import { Matrix3 } from '../../Source/Cesium.js';
import { Matrix4 } from '../../Source/Cesium.js';
import { Plane } from '../../Source/Cesium.js';

describe('Core/Plane', function() {

    it('constructs', function() {
        var normal = Cartesian3.UNIT_X;
        var distance = 1.0;
        var plane = new Plane(normal, distance);
        expect(plane.normal).toEqual(normal);
        expect(plane.distance).toEqual(distance);
    });

    it('constructor throws without a normal', function() {
        expect(function() {
            return new Plane(undefined, 0.0);
        }).toThrowDeveloperError();
    });

    it('constructor throws if normal is not normalized', function() {
        expect(function() {
            return new Plane(new Cartesian3(1.0, 2.0, 3.0), 0.0);
        }).toThrowDeveloperError();
    });

    it('constructor throws without a distance', function() {
        expect(function() {
            return new Plane(Cartesian3.UNIT_X, undefined);
        }).toThrowDeveloperError();
    });

    it('constructs from a point and a normal', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var point = new Cartesian3(4.0, 5.0, 6.0);
        var plane = Plane.fromPointNormal(point, normal);
        expect(plane.normal).toEqual(normal);
        expect(plane.distance).toEqual(-Cartesian3.dot(normal, point));
    });

    it('constructs from a point and a normal with result', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var point = new Cartesian3(4.0, 5.0, 6.0);

        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        Plane.fromPointNormal(point, normal, plane);

        expect(plane.normal).toEqual(normal);
        expect(plane.distance).toEqual(-Cartesian3.dot(normal, point));
    });

    it('constructs from a Cartesian4 without result', function() {
        var result = Plane.fromCartesian4(Cartesian4.UNIT_X);

        expect(result.normal).toEqual(Cartesian3.UNIT_X);
        expect(result.distance).toEqual(0.0);
    });

    it('constructs from a Cartesian4 with result', function() {
        var result = new Plane(Cartesian3.UNIT_X, 0.0);
        Plane.fromCartesian4(Cartesian4.UNIT_X, result);

        expect(result.normal).toEqual(Cartesian3.UNIT_X);
        expect(result.distance).toEqual(0.0);
    });

    it('fromPointNormal throws without a point', function() {
        expect(function() {
            return Plane.fromPointNormal(undefined, Cartesian3.UNIT_X);
        }).toThrowDeveloperError();
    });

    it('fromPointNormal throws without a normal', function() {
        expect(function() {
            return Plane.fromPointNormal(Cartesian3.UNIT_X, undefined);
        }).toThrowDeveloperError();
    });

    it('fromPointNormal throws if normal is not normalized', function() {
        expect(function() {
            return Plane.fromPointNormal(Cartesian3.ZERO, Cartesian3.ZERO);
        }).toThrowDeveloperError();
    });

    it('fromCartesian4 throws without coefficients', function() {
        expect(function() {
            return Plane.fromCartesian4(undefined);
        }).toThrowDeveloperError();
    });

    it('fromCartesian4 throws if normal is not normalized', function() {
        expect(function() {
            return Plane.fromCartesian4(new Cartesian4(1.0, 2.0, 3.0, 4.0));
        }).toThrowDeveloperError();
    });

    it('gets the distance to a point', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var plane = new Plane(normal, 12.34);
        var point = new Cartesian3(4.0, 5.0, 6.0);

        expect(Plane.getPointDistance(plane, point)).toEqual(Cartesian3.dot(plane.normal, point) + plane.distance);
    });

    it('getPointDistance throws without a plane', function() {
        var point = Cartesian3.ZERO;
        expect(function() {
            return Plane.getPointDistance(undefined, point);
        }).toThrowDeveloperError();
    });

    it('getPointDistance throws without a point', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        expect(function() {
            return Plane.getPointDistance(plane, undefined);
        }).toThrowDeveloperError();
    });

    it('projects a point onto the plane', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        var point = new Cartesian3(1.0, 1.0, 0.0);
        var result = Plane.projectPointOntoPlane(plane, point);
        expect(result).toEqual(new Cartesian3(0.0, 1.0, 0.0));

        plane = new Plane(Cartesian3.UNIT_Y, 0.0);
        result = Plane.projectPointOntoPlane(plane, point);
        expect(result).toEqual(new Cartesian3(1.0, 0.0, 0.0));
    });

    it('projectPointOntoPlane uses result parameter', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        var point = new Cartesian3(1.0, 1.0, 0.0);
        var result = new Cartesian3();
        var returnedResult = Plane.projectPointOntoPlane(plane, point, result);
        expect(result).toBe(returnedResult);
        expect(result).toEqual(new Cartesian3(0.0, 1.0, 0.0));
    });

    it('projectPointOntoPlane requires the plane and point parameters', function() {
        expect(function() {
            return Plane.projectPointOntoPlane(new Plane(Cartesian3.UNIT_X, 0), undefined);
        }).toThrowDeveloperError();

        expect(function() {
            return Plane.projectPointOntoPlane(undefined, new Cartesian3());
        }).toThrowDeveloperError();
    });

    it('clone throws without a plane', function() {
        expect(function() {
            Plane.clone(undefined);
        }).toThrowDeveloperError();
    });

    it('clones a plane instance', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var distance = 4.0;
        var plane = new Plane(normal, distance);

        var result = Plane.clone(plane);
        expect(result.normal).toEqual(normal);
        expect(result.distance).toEqual(distance);
    });

    it('clones a plane instance into a result paramter', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var distance = 4.0;
        var plane = new Plane(normal, distance);

        var result = new Plane(Cartesian3.UNIT_X, 1.0);

        Plane.clone(plane, result);
        expect(result.normal).toEqual(normal);
        expect(result.distance).toEqual(distance);
    });

    it('equals returns true only if two planes are equal by normal and distance', function() {
        var left = new Plane(Cartesian3.UNIT_X, 0.0);
        var right = new Plane(Cartesian3.UNIT_Y, 1.0);

        expect(Plane.equals(left, right)).toBe(false);

        right.distance = 0.0;

        expect(Plane.equals(left, right)).toBe(false);

        right.normal = Cartesian3.UNIT_X;

        expect(Plane.equals(left, right)).toBe(true);

        right.distance = 1.0;

        expect(Plane.equals(left, right)).toBe(false);
    });

    it('equals throws developer error is left is undefined', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        expect(function() {
            return Plane.equals(undefined, plane);
        }).toThrowDeveloperError();
    });

    it('equals throws developer error is right is undefined', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        expect(function() {
            return Plane.equals(plane, undefined);
        }).toThrowDeveloperError();
    });

    it('transforms a plane according to a transform', function() {
        var normal = new Cartesian3(1.0, 2.0, 3.0);
        normal = Cartesian3.normalize(normal, normal);
        var plane = new Plane(normal, 12.34);

        var transform = Matrix4.fromUniformScale(2.0);
        transform = Matrix4.multiplyByMatrix3(transform, Matrix3.fromRotationY(Math.PI), transform);

        var transformedPlane = Plane.transform(plane, transform);
        expect(transformedPlane.distance).toEqual(plane.distance * 2.0);
        expect(transformedPlane.normal.x).toEqualEpsilon(-plane.normal.x, CesiumMath.EPSILON10);
        expect(transformedPlane.normal.y).toEqual(plane.normal.y);
        expect(transformedPlane.normal.z).toEqual(-plane.normal.z);
    });

    it('transform throws without a plane', function() {
        var transform = Matrix4.IDENTITY;
        expect(function() {
            return Plane.transform(undefined, transform);
        }).toThrowDeveloperError();
    });

    it('transform throws without a transform', function() {
        var plane = new Plane(Cartesian3.UNIT_X, 0.0);
        expect(function() {
            return Plane.transform(plane, undefined);
        }).toThrowDeveloperError();
    });
});
